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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9cd1b5515d69615809d981d5f6f366e5653a0233e3fae64ef60e281214526e' 
  AND token = 'KRWOK0/BQNcH1TZj05Auws05tQGqcAk4IoDQJQ7SSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}